An earlier GigaPan of Sam Houston Statue can be seen here: http://share.gigapan.org/viewGigapanFullscreen.php?id=9906
This should be entitled something like, "Continuation of Engle's Transportation Series, Past and Future," or a better one would be simply, "One Lucky Shot."
Just playing around with taking hand-held photos using the SX110 and just accidentally caught two trains on either side of Sam Houston Statue.
It is only 9 images, but the panorama looks cool and happened on a hot day in Houston, Texas.
Using the robot, I do not believe I could have captured a moment like what we see above: 9 photos in less than a minute [left to right]. This is a reason to always try to carry a camera for those unexpected moments in time we call great panoramas.